Which is the fastest whale in world?

The sperm whale is generally considered the fastest whale in the world. While they don't reach the speeds of some fish, they are capable of short bursts of up to 23 mph (37 kph) when diving or chasing prey.

However, it's important to note that:

* Speed records are difficult to measure accurately in the wild.

* Different whales have different top speeds depending on their size, body shape, and the context of their movement (e.g., diving, migrating, escaping).

So, while the sperm whale is widely considered the fastest, it's a relative comparison, and other whales like the orca and blue whale can also reach impressive speeds.